Rong Di (戎狄) is one of the names for Chi Di, Beidi, and, Xi Rong (西戎, Xionites).
Xi Rong(西戎), China Barbarian in the history of living in the west (migrants) also known as the call said. Rong Di(戎狄) as a representation throughout the northern and western barbarians even nominal, but defense, depending on each of four corners typically separated by Dong Yi(东夷), Xi Rong, Beidi has been called into.
In BC 200 ~ AD 200, Beidi joined the Donghu people, Yan (state)'s any people, they are Xianbei, so actually Xianbei not Xiongnu.
Bai Di(白狄) Xian Yu Bu(鮮虞部) make Zhongshan (state)